Happened to me about 10 years ago, only time I've seen it. I posted here. It was
quite a sight. Just last night I was thinking probably the last squash I'd use this season when I was cutting one in half and it had that sort of spongy dried out center. No sprouting present this time. I baked some sweet potatoes instead, but peeled the squash and discarded the spongy part, will dice and roast with Moroccan spices for dinner tonight. Hopefully, it will still be good.